Waterwheel Park in Lanzhou

Photo taken on May 15 shows the Waterwheel Park in Lanzhou City, capital of Gansu Province. The Lanzhou Waterwheel, an irrigation tool with a history of nearly 5,000 years, uses flowing or falling water to create power through paddles mounted around a wheel. Its culture has become an important part of the wider Yellow River culture. [Photo/Gscn.com.cn]